Estimating the agronomic impact of white clover mosaic virus on white clover performance in the North Island of New Zealand

1998 ◽  
Vol 41 (2) ◽  
pp. 171-178 ◽  
Author(s):  
B. Dudas ◽  
D. R. Woodfield ◽  
P. M. Tong ◽  
M. F. Nicholls ◽  
G. R. Cousins ◽  
...  
Keyword(s):  
New Zealand ◽  
Mosaic Virus ◽  
White Clover ◽  
The North ◽  
White Clover Mosaic Virus

The effect of white clover mosaic virus on nodulation of white clover (Trifolium repens L. cv. Ladino)

1980 ◽  
Vol 31 (2) ◽  
pp. 307 ◽  
Author(s):  
P Guy ◽  
A Gibbs ◽  
K Harrower
Keyword(s):  
Virus Infection ◽  
Mosaic Virus ◽  
White Clover ◽  
Trifolium Repens ◽  
Effective Strain ◽  
Plant Weight ◽  
Trifolium Repens L ◽  
White Clover Mosaic Virus ◽  
Infected Nodule ◽  
Mosaic Virus Infection

White clover mosaic virus infection of Ladino clover seedlings resulted in decreased plant weight and a 71 % decrease in the number of nodules per plant without the decrease in nodule size which is usually observed when legumes are virus-infected. Nodule numbers decreased both on plants nodulated with an effective strain and on those with an ineffective strain of Rhizobium.

scholarly journals Viruses of White Clover in Pastures of Pennsylvania, New York, and Vermont

Plant Disease ◽  
1997 ◽  
Vol 81 (7) ◽  
pp. 817-820 ◽  
Author(s):  
Robert T. Sherwood
Keyword(s):  
New York ◽  
Mosaic Virus ◽  
White Clover ◽  
Significant Variation ◽  
Alfalfa Mosaic Virus ◽  
Red Clover ◽  
Yellow Mosaic Virus ◽  
Peanut Stunt Virus ◽  
Clover Yellow Mosaic Virus ◽  
White Clover Mosaic Virus

Incidence of six viruses was tested in white clover from 28 rotationally grazed pastures of Pennsylvania (PA), New York (NY), and Vermont (VT). Each of 17 PA pastures was sampled fall 1994, spring 1995, fall 1995, and spring 1996, and 10 pastures were sampled fall 1996. Each of five NY and six VT pastures was sampled spring and fall 1995 and 1996. Enzyme-linked immunosorbent assays (ELISA) were conducted for red clover vein mosaic virus (RCVMV), white clover mosaic virus (WCMV), alfalfa mosaic virus (AlMV), peanut stunt virus (PSV), clover yellow mosaic virus (CYMV), and the potyvirus group (POTY). RCVMV, WCMV, AlMV, and POTY were detected in 28, 28, 27, and 25 of the 28 pastures and in 67, 32, 30, and 7% of the 3,065 samples tested, respectively. PSV occurred at low to moderate levels in 11 PA pastures. PSV was rare in NY and was not detected in VT. CYMV was never found. Incidence of each virus varied significantly among pastures. For any given virus, there was not a significant variation in incidence among sampling dates within the NY-VT samples. RCVMV, WCMV, and POTY varied among dates within PA.

scholarly journals Characterization of the Coat Protein Subgenomic RNA of White Clover Mosaic Virus

1987 ◽  
Vol 68 (1) ◽  
pp. 181-190 ◽  
Author(s):  
R. L. S. Forster ◽  
P. J. Guilford ◽  
D. V. Faulds
Keyword(s):  
Coat Protein ◽  
Mosaic Virus ◽  
White Clover ◽  
Subgenomic Rna ◽  
White Clover Mosaic Virus

White clover (Trifolium repens) and associated viruses in the subalpine region of south-eastern Australia: implications for GMO risk assessment

2004 ◽  
Vol 52 (3) ◽  
pp. 321 ◽  
Author(s):  
R. C. Godfree ◽  
P. W. G. Chu ◽  
M. J. Woods
Keyword(s):  
Mosaic Virus ◽  
Plant Communities ◽  
White Clover ◽  
Alfalfa Mosaic Virus ◽  
Yellow Vein ◽  
Native Plant ◽  
Eastern Australia ◽  
Clover Yellow Vein Virus ◽  
Subalpine Region ◽  
White Clover Mosaic Virus

Over the past several years, increased emphasis has been placed on conducting comprehensive ecological-risk assessments of virus-resistant genetically modified organisms (GMOs) prior to their release into the environment. In this paper we report on the first stage in our assessment of the level of risk posed by virus-resistant transgenic Trifolium repens L. (white clover) to native plant communities in south-eastern Australia. We investigated the distribution, abundance and phytosociological characteristics of naturalised T. repens populations in two areas in the subalpine region of New South Wales (NSW) and the Australian Capital Territory (ACT), and determined the distribution and abundance of Alfalfa mosaic virus, Clover yellow vein virus and White clover mosaic virus in 31 populations of white clover in this region. We found that T. repens is a significant component of Poa grasslands and Eucalyptus–Poa woodlands in the subalpine region, but is absent or rare in Eucalyptus species forests and Carex–Poa species bogs. Clover yellow vein virus was by far the most common virus in the study area, being present in 18% of T. repens plants across a wide range of plant communities. Alfalfa mosaic virus and White clover mosaic virus were each recorded in only one white-clover population growing in a native plant community. We conclude that white clover is a significant constituent of subalpine grasslands and woodlands in the region studied, and that of the viruses investigated, Clover yellow vein virus is the most abundant and widespread.

Effect of white clover mosaic virus infection on various processes relevant to symbiotic N2 fixation in red clover

1984 ◽  
Vol 62 (1) ◽  
pp. 38-43 ◽  
Author(s):  
A. H. Khadhair ◽  
R. C. Sinha ◽  
J. F. Peterson
Keyword(s):  
Virus Infection ◽  
Mosaic Virus ◽  
White Clover ◽  
Nitrogenase Activity ◽  
Reductase Activity ◽  
Red Clover ◽  
Flower Senescence ◽  
Root Weight ◽  
White Clover Mosaic Virus ◽  
Mosaic Virus Infection

The effect of white clover mosaic virus infection on several factors relevant to symbiotic N2 fixation was determined in nodulated red clover (Trifolium pratense L.) plants at 10-leaf, preblooming, blooming, and flower-senescence stages of growth, corresponding to 3, 6, 9, and 12 weeks after virus inoculation, respectively. Virus infection caused a significant [Formula: see text] reduction of plant growth (top and root weight), nodulation (number and weight of nodules), rhizobial population, nitrogenase activity, and leghemoglobin concentration in the nodules. The presence of a high concentration of virus within nodules at all harvest times was indicated by infectivity assays. The leghemoglobin was shown to be localized in the peribacteroidal space by a cytochemical technique. A significant increase in inducible nitrate reductase activity was associated with virus infection of plants.

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